Grinding machine



Sept. 4, 1934. F a HM 1,972,826

GRINDING MACHINE Filed Jan. 29, 1932 2 Sheets-Sheet 1 Sept. 4,-'1934. F. s. HAAS GRINDING MACHINE Filed Jan. 29, 1932 Z ShQetS-Sheet 2 IIIII/IA Patented Sept. 4, 1934 UNITED STATES.

GRINDING MACHINE Frederick S. Haas, Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated, Cincinnati,

Ohio, a corporation of Ohio Application January 29, 1932, Serial No. 589,698

4 Claims. (Cl. 125-11) This invention relates to improvements in machine tools and especially to improvements in grinding machine structures.

An object of the invention is the provision of an improved mechanism adapted for cambering or crowning the operative face of a grinding wheel, which is particularly adapted for grinding the crown or camber on large rolls such as used in rolling mills.

A further object of the invention is the provision of a simple, inexpensive mechanism that may be readily mounted on existing portions of grinding machines for accomplishing the above noted object.

An additional object of the invention is the provision of improved means for adjusting the said wheel trimming or truing mechanism to obtain various radii of contouron the work.

Other objects and advantages of thepresent invention should be readily apparent by reference to the following specification considered in conjunction with the accompanying drawings forming a part thereof,.and it is to be understood that any modifications may be made in the exact structural details there shown and described,

within the scope of the appended claims, without invention. 7

In the drawings:

, Figure 1 is a front elevation of a grinding machine embodying the improvements of this invention. V

Figure 2 is a view taken substantially on line 2-2 of Figure 1, showing a portion of the machine in elevation and other portions in cross section.

Figure 3 is, a fragmentary sectional view taken on line 3-3 of Figure 2.

Figure 4 is an end elevational view of the truing element and parts supporting it as seen particularly from line 4-4 of Figure 2.

Figure 5 is a fragmentary sectional view'taken on line 55 of Figure 2.

Figure 6 is a fragmentary sectional view taken on line 6-6 of Figure 2.

Figure 7 is a view partly in section and partly in elevation as seen particularly from line 7-7 of Figure 2.

Throughout the several views of the drawings similar reference characters are employed to de- 50 note the same or similar parts.

Large rolls such as those used in rolling mills are frequently provided with a slight camber or crown which extends from one end of the roll to the other. In the production of these rolls the 55 grinding wheel is actuated toward and from the departing fromor exceeding the spirit of the axial center of the work during its axial travel past the wheel. For providing the desired finish on the rolls, resort is had to an oppositely contoured grinding wheel which effectively eliminates a spiral track which would result if a plain faced wheel were used. It isunderstood that the crown on the wheel is of a considerable radius since it need'be only sufficient to, prevent the corner of the wheel from digging into the work as y it is traversed thereby. Accordingly, considerable difficulty was experienced in producing/a mechanism of suificient compactness and simplicity to be mounted on the machine for accomplishing this result. These difficulties and inconveniences have been obviated by the mechanism disclosed in the drawings. Y A'machine for grinding the-rolls comprises ,a bed 10,having formed on the upper face thereof guideways 11 for a translatabletable 12 mounted thereon The table 12 has secured to it near its oppositevendsa head stock-13 and atail stock 14, from which respectively project centers 15 and 16 which centralize the work as respects the grinding wheel. The table 12 is further providedwith journaled rests 17 and 18 respectively engaging the opposed journal bearings 19 of the work 20. The body. of the roll'20 is located between the journals 19 and it is this portion that is adapted to be produced with a camber or crown. The work is suitably dogged as at 21,;with' the head stock 13 .whereby it is rotatedthrough the prime mover or motor 22 secured to the head stock 13. The table 12 is adapted to be translated either manually by means of hand wheel 23 or by power in the usual manner, which power means is reversible through the reversing lever 24.

Mounted on the bed for movement transversely thereof toward and from the tablel2 is a spindle carriage which has secured to it a guard25. This guard 25 encloses a grinding Wheel 26'secured to the spindle of the carriage and through the rotation of the spindle, the wheel is properly rotated. Any desirable means maybe employed for effecting the in and out movement of the grinding wheel during the travel of the work past the-wheel.

As shown in Figure 3, the tail stock center 16 is provided with the usual taper and is received in a correspondingly tapered socket 2'7 formed in the forward end of the tail stock spindle 28adapted to beaxially adjusted relative to the tail stock housing 29. The. housing 29 terminates in a cylindrical barrel portion 30 in which the spindle is mounted for axial movement relative thereto. 7 At the forward end of the barrel ,30. it is provided with a reduced sleeve-like portion 31 encircled in actual practice by a flange 32 of cup shaped cap 33. This cap 33 is secured by means of screws or bolts 34 to the forward end of the spindle 29 and is movable with said spindle during its axial adjustment.

The truing or grinding attachment forming the subject of this invention is carried by or secured to thiscup shaped cap 33 and for which purpose the cap has formed therein a locating notch or pocket 35 receiving a pin 36. The pin 36 is secured in a ring like bracket 37 which entirely surrounds the cap 33. The bracket 37 has inte-' gral therewith a sleeve-like or tubular portion 38 which extends in a direction parallel with the general horizontal axis of the machine. The

ring-like bracket 37 is further provided witha' boss 39 having threaded therein a screw 40 operated by the integral knob orhandle 41.; The'in-. ner end of the screw 40 actuates a clamping shoe 42 which engages with the outer surface 'of' the shaft 43 terminates in a flange portion 45 while the inner end of the said shaft has a reduced 7 portion 46 integral therewith. The flanged pora body portion 56 whichv is jo'urnaled in the bracket 52 so that its axis ism-incidental with the axis of the shaft 53 when mounted in opera tive position; A reduced portion 57 extends from the body portion 56 to which is secured a hand wheel 58 whereby the said stud is rotated. It

should be noted that the internal gears 47 and v 51 are of the same pitch but that there'is a different number of'teeth in each gear, preferably a single tooth differential existing'betwe'en'them; so that these gears together with the pinion 48 constitute a planetary'gear system for rotating the shaft 43 at a 'very slow ratecompared to the rotation of the headed stud 50.

The sleeve or' bearing 38 terminatesin a hood I or guard 59'which encloses the reduced end 46 of the shaft 43. I Secured to this reduced portion of theshaft is an arm 60 having formed in its lower end a guideway 61 receiving a block 62. Extending through the arm and communicating g with the guideway 61 is an elongated perforation 63through which a'bolt 64 projects'having its threaded portion received in the block 62 and clamping the said block in adjusted positions thereby. The block '62 is further providedwith a perforationreceiving a diamond or other truing tool holder 65 whichis clampedin position therein by means of a set screw or the likej66. To properly adjust the block 62 relative to the arm 60, it isprovided with suitable'graduations 67'co-operating with a fixed point 68 carried by the arm 66 adjacent the guideway 61. In order to prevent moisture or coolant from entering the bearings 44, the hood 59 has secured to it a plate orguard 69, thereby completely enclosing the end of the shaft 43. r

The operation of the mechanism is as follows. The table 12 is actuated relative to the bed 10 to align the horizontal axis of the shaft 43 with the vertical axis or center of the wheel. The diamond 65 was previously adjusted relative to the arm 60 to the proper position below the plane of the horizontal center of the wheel depending on the amount of camber or crow-ndesired to be formed on the wheel; The grinding'wheel is then fed toward the table to engage the diamond or truing tool with one corner of the grinding wheel at the point below the plane of the horizontal center thereof." The hand wheel 58'is then rotated for actuating the arm 66 through a vertical plane, which due to its position relative to the grinding wheel'effe'cts an arcuate movement as respects th e'active' 'face" thereof. After each pass of the diamond across the face of the wheel, the wheel is fed in the desired amount for the next pass of the tool relative thereto.

This continues until the desired crown or camber is provided on'the Wheel. The planetary gear' mechanism including the pinion 48 and internal gears 51 and 47, efiects a veryslow uniform movement of the diamond relative to the wheel so that a true face is formed on the grinding wheel.

In order to prevent the armfifl falling by grav ity to ,a hoiizontal position. and to lioldthe said arm in any desiredangular position/the sleeve or bearing portion 38 is provided near the flange 54with'; a pair of sockets 7 0'and 71 each of which is mounted .a spring 72' abutting on one end with a plug '73 and'on the other end with friction drag shoes '74. The other end of the shoes '74 is held in frictional engagement with the flangev45 and eifectively holds the said flange to preventinadvertent rotation thereof.

"Whatiscla'imed is: I v v 1 Ina truing device of the messesmbed for crowning, the operative, face of a 'circular wheel the. combination with a bed rotatablysupporting the wheel, of a rotatableshaft having its axis -dis.- posed at right angles to the axis of; the wheel, an arm carried by the shaft for movement therewith through a plane parallel with" atangent .of the wheel,,.a resurfacing tool. carried byfthe arm'for movement .'.th'erewit'h' "through a plane parallel with the tangent, but which plane is disposed between the tangent and the axis of the wheel and whereby oscillation of the.- truing tool provides a crown on the surface of the wheehand means for adjusting the truing tool in its plane of move ment toward andfrom the axis of the shaft to vary the'crownproduceld onthe wheel.

In a truing device, of the class described for crowning the operativeflface .of a circular wheel the combination with a bed rotatably supporting the wheel of arotatable shaft having its axis disposed at right'anglesto the axis'of the wheel, a'n'arm carried bylthe shaft for movement therewith through aplane parallel with a tangent of the wheel, aresurfacing' tool carried by the arm for movement therewith through a plane parallel with the tangent but which plane is disposed be: tween the tangent and the axispfthe wheel and whereby oscillation of the-truing toolprovidesa crown on the surface of the wheel, and means for adjusting the truing tool in its plane of movement towardand from the axis of the shaft to vary the crown produced on, the wheel, said adjusting meansicomprising a block supporting the tool, and clamping and 'guidingvmeans carried .by the arrnforthe block.,. i v

. 3. In atruing device of. the class described the combinationwitna bed for, rotatably supporting a circular grinding wheel adapted to have its operative surface crowned, of a tail stock supported by the bed adjacent the operative face of the grinding wheel, a bracket secured to the tail stock, a shaft oscillatably journaled in the bracket having its axis at right angles to the axis of the grinding wheel, the axes of the grinding wheel and shaft lying in spaced parallel planes, a truing tool carried by the shaft and oscillatable therewith through a plane normal to the parallel planes of the axes of the wheel and shaft but contacting with the wheel at a point lying outside of the plane of the wheel axis above referred to, and means for adjusting the position of the truing tool as respects the plane of the wheel axis.

4. In a truing device of the class described the combination with a bed for rotatably supporting a circular grinding wheel adapted to have its operative surface crowned, of a tail stock supported by the bed adjacent the operative face of the grinding wheel, a bracket secured to the tail stock, a shaft oscillatably j ournaled in the bracket having its axis at right angles to the axis of the grinding wheel, the axes of the grinding wheel and shaft lying in spaced parallel planes, a truing tool carried by the shaft and oscillatable therewith through a plane normal to the parallel planes of the axis of the wheel and shaft but contacting with the wheel at a point lying outside of the plane of the wheel axis above referred to, means for adjusting the position of the truing tool as respects the plane of the wheel axis, and rotary means carried by the bracket for effecting the slow steady oscillatory movement of the shaft and truing tool.

FREDERICK S. HAAS. 

